/Engine/Source/Runtime/Analytics/AnalyticsET/Public/AnalyticsProviderETEventCache.h
Adds a new event to the cache. If the estimated payload size will increase beyond MaximumPayloadSize then a flush will be queued here. This will makeHasFlushesQueued()== true.
void AddToCache ( [FString](API\Runtime\Core\Containers\FString) EventName )